Causes

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Many factors, such as the anatomy of your mouth and sinuses, alcohol consumption, allergies, a cold, and your weight, can lead to snoring.

When you doze off and progress from a light sleep to a deep sleep, the muscles in the roof of your mouth (soft palate), tongue and throat relax. The tissues in your throat can relax enough that they partially block your airway and vibrate. And, the more narrowed your airway, the more forceful the airflow becomes. This causes tissue vibration to increase, which causes your snoring to grow louder.

The following conditions can affect the airway and cause snoring:

Your mouth anatomy. Having a low, thick soft palate can narrow your airway. People who are overweight may have extra tissues in the back of their throat that may narrow their airways. Likewise, if the triangular piece of tissue hanging from the soft palate (uvula) is elongated, airflow can be obstructed and vibration increased.

Alcohol consumption. Snoring also can be brought on by consuming too much alcohol before bedtime. Alcohol relaxes throat muscles and decreases your natural defenses against airway obstruction.

Sleep apnea. Snoring also may be associated with obstructive sleep apnea. In this serious condition, your throat tissues partially or completely block your airway, preventing you from breathing.

Sleep apnea often is characterized by loud snoring followed by periods of silence when breathing stops or nearly stops. Eventually, this reduction or pause in breathing may signal you to wake up, and you may awaken with a loud snort or gasping sound. You may sleep lightly due to disrupted sleep. This pattern of breathing pauses may be repeated many times during the night.

People with sleep apnea usually experience periods when breathing slows or stops at least five times during every hour of sleep.

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